Effect of Bi₂O₃, B₂O₃ and V₂O₅ Sintering Additives on Phase Composition, Microstructure and Electrical Resistivity of SrAlFe₁₁O₁₉ Ceramics

Abstract

Sintering aids play a crucial role in enhancing the properties of various ceramics, offering benefits such as increased density, lowered sintering temperatures, and changes in material electrical characteristics. This study focuses on investigating the impact of 3 wt.% additions of Bi2O3, B2O3, and V2O5 on the structural, morphological, and electrical properties of hexaferrite SrAlFe11O19 ceramics, known for their significance in microwave applications. Obtained by conventional solid-state synthesis, ceramic samples were subjected to X-ray diffraction (XRD) analysis, Raman spectroscopy, scanning electron microscopy (SEM), and resistivity measurements. Results revealed that the addition of Bi2O3 and V2O5 effectively reduced porosity in hexaferrite ceramics, which can potentially increase the magnetization values of ferrite material. Notably, the sample with 3 wt.% of B2O3 exhibited the highest resistivity, reaching 1.9·107 Ω·cm. These findings suggest that incorporating specific sintering aids can help in achieving controlled conductivity and magnetization in hexaferrite ceramics, which is particularly beneficial for microwave components like inductors, antenna substrates, and circulators.